It comes after a person died and another was hospitalised earlier in the month.
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In 2017, the United Nations criticised New Zealand over its use of restraint chairs.
National's police spokesperson is urging the Government to get back to the negotiating table with the Police Association.
"This serious crash happened on the Auckland motorway where someone's mattress came loose and caused absolute carnage."
"The environment is interchangeable, which may lead to funding not being fully utilised within the expected timeframes."
An officer injured in the incident is in a stable condition.
Police Association president Chris Cahill said there are too many firearms with criminals in New Zealand.
Police told an expert panel - which had earlier warned them against the road policing algorithm - that they have dumped it.